<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo_dengpao.jpg" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside class="aside" :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <el-menu
          :default-active="activePath"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
          :collapse="isCollapse"
          unique-opened
          :collapse-transition="false"
          router
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menuList"
            :key="item.id"
          >
            <template slot="title">
              <i class="el-icon-location"></i>
              <span> {{ item.authName }} </span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
              ><template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ subItem.authName }}</span>
              </template></el-menu-item
            >
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      menuList: [],
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
      console.log(activePath)
    }
  }
}
</script>
<style scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #83837e;
  display: flex;
  justify-content: space-between;
}
.el-header div span {
  line-height: 60px;
  color: #ccc;
  font-weight: 700;
}
.el-header img {
  height: 50% !important;
  vertical-align: middle;
  margin-right: 15px;
}
.el-button {
  margin: 12px 0;
}
.aside {
  background-color: #545c64;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
